Date: Tue, 22 Sep 2015 21:33:53 +0200 From: deco33000 Jog <deco33000@yandex.com> To: Wojciech Puchar <wojtek@puchar.net> Cc: Julian Elischer <julian@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Virtual images and qemu Message-ID: <903401442950433@web20h.yandex.ru> In-Reply-To: <alpine.BSF.2.20.1509222115040.4263@laptop.wojtek.intra> References: <730481442868585@web10h.yandex.ru> <5600F6D4.5040007@freebsd.org> <184701442916573@web12h.yandex.ru> <alpine.BSF.2.20.1509222115040.4263@laptop.wojtek.intra>
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You are right, and I understand the paramount of virtualization. Hence my use of it now. But it doesn't change a hair of my position: I hate it but still use it. --š Jog 22.09.2015, 21:29, "Wojciech Puchar" <wojtek@puchar.net>: >> šNow it is fully working. I switched to virtualbox and chose a nat paravirt network. > > anyway FreeBSD 10.2 works fine under qemu - both amd64 and i386. tested. > Anyway i never used qcow2 images, always raw. > >> šI really hate virtualization but will bear with it anyway. > > instead of hate it's better to understand. > > Cases where virtualization is useful: > > - quick test of operating system (probably your case) > - OS/kernel development - avoids reboot as well as provide freeze and > memory dump. > - when you have to run more than 1 different OS on one machine. For > example: FreeBSD server but needs to run some server software under windows. Run > windows virtual machine on this server with this software in it. > - preparing software disk image for different architecture (often used > be me for FreeBSD/mips, qemu on fast PC runs faster than actual machine > and it's easier). > - recovery of data from disks or disk images > - may be few more. > > Cases where it is not useful, or suboptimal: > > - running multiple images of same unix system (eg. FreeBSD, linux) on one > computer. Use jails or similar mechanism under other unix-alike. > - magic way to enhance security. No it isn't. > - running windows desktops for terminal systems, one virtual machine per > user. Suboptimal and costly, run multiple users on single windows > computer. > - REALLY lots of other uses just because virtualization is popular. > > Virtualbox is MUCH faster, qemu is much more universal. Virtualization > always make performance overhead, and always bigger than authors claim. > Still - it is much better running some software set even with 50% overhead, than buying > separate machine that would be 1% utilized.
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